When it comes to discussing seismic activity, there are a variety of terms that can be used to describe a secondary tremor on the Richter scale. One term that is often used as a synonym is an aftershock. This is defined as a smaller earthquake that follows a larger earthquake, occurring in the same area within a relatively short period of time. Another term that may be used is a foreshock, which is a smaller earthquake that occurs before a larger earthquake in the same area. Other synonyms for points on the Richter scale secondary tremor may include seismic tremors, earth movements, and earthquake activity. It's important to use accurate terminology when describing seismic events to ensure clear communication and understanding.